CN110525048B - Device, system and method for measuring volume of ink drop - Google Patents
Device, system and method for measuring volume of ink drop Download PDFInfo
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- CN110525048B CN110525048B CN201910813624.8A CN201910813624A CN110525048B CN 110525048 B CN110525048 B CN 110525048B CN 201910813624 A CN201910813624 A CN 201910813624A CN 110525048 B CN110525048 B CN 110525048B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/0456—Control methods or devices therefor, e.g. driver circuits, control circuits detecting drop size, volume or weight
Abstract
The invention discloses a device, a system and a method for measuring the volume of an ink drop, which relate to the technical field of display and achieve the purpose of improving the precision of calculating the volume of the ink drop. The main technical scheme of the invention is as follows: the method comprises the following steps: the charging cavity is used for being arranged opposite to the nozzle so that the ink drops sprayed by the nozzle enter the charging cavity and are used for charging preset charges; the electric field cavity is communicated with the charging cavity, and a deflection electric field is formed in the electric field cavity and is used for deflecting the ink drops; the collecting component is arranged in the electric field cavity and used for acquiring a first distance of the ink drops moving along the electric field lines in the deflection electric field and a second distance of the ink drops moving along the electric field lines in the electric field: and the processing circuit is connected with the collecting component and is used for calculating the volume of the ink drops according to the first distance and the second distance of the ink drops, the charge quantity of the preset charges and the electric field intensity of the deflection electric field. The invention is mainly used for measuring the volume of ink drops.
Description
Technical Field
The invention relates to the technical field of display, in particular to a device, a system and a method for measuring the volume of an ink droplet.
Background
An Organic light-emitting diode (OLED) display panel is a display device formed by encapsulating Organic materials, and has the advantages of low working voltage, high response speed, high light-emitting efficiency, wide viewing angle, wide working temperature and the like, and is beneficial to light and thin, low power consumption and curved surface design of the display device. Compared with LCDs, organic electroluminescent devices (OLEDs) have the advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright color, lightness and thinness, and are considered as next-generation display technologies.
The film forming method of OLED mainly includes evaporation process and solution process. The evaporation process is well-established in small-scale applications, and the technology is currently applied in mass production. The film forming method of the solution process OLED mainly includes inkjet printing, nozzle coating, spin coating, screen printing, and the like, wherein the inkjet printing technology is considered as an important method for realizing mass production of large-sized OLEDs due to its high material utilization rate and the realization of large-size.
The method for manufacturing the OLED display product by using the ink-jet printing method has the advantages of high material utilization rate, short manufacturing time and the like, so that the method for manufacturing the OLED display product by using the ink-jet printing method is paid attention by more and more manufacturers.
Inkjet printing of OLED display products requires precision to each pixel, so the precision requirement for printing ink drops during inkjet printing is relatively high. Meanwhile, in order to control the accuracy of the print film thickness, accurate control is also required for the amount of ink to be driven into each pixel. This requires precise control of the volume of the ink drops ejected from each nozzle, and typically requires that the volume difference between the ink drops is ± < 0.5% or less to ensure that the device is lit without mura. However, for such small ink droplets, it is difficult to accurately measure the volume of the ink droplet, and in the prior art, the ink droplet can be directly photographed by a CCD (charge coupled device image sensor), and then the volume of the ink droplet can be calculated by the photograph.
Disclosure of Invention
In view of this, embodiments of the present invention provide an apparatus, a system and a method for measuring the volume of an ink drop, and mainly aim to improve the accuracy of calculating the volume of the ink drop.
In one aspect, embodiments of the present invention provide an apparatus for measuring a volume of an ink droplet, the apparatus including:
a charging chamber for being disposed opposite to the nozzle so that an ink droplet ejected from the nozzle enters the charging chamber and for charging the ink droplet with a predetermined charge;
the electric field cavity is communicated with the charging cavity, and a deflection electric field is formed in the electric field cavity and is used for deflecting the ink drops;
the collecting component is arranged in the electric field cavity and used for acquiring a first distance of the ink drops moving along the electric field lines in the deflection electric field and a second distance of the ink drops moving along the electric field lines in the electric field:
and the processing circuit is connected with the collecting part and is used for calculating the volume of the ink drops according to the first distance and the second distance of the ink drops, the charge quantity of the preset charges and the electric field intensity of the deflection electric field.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Specifically, the method further comprises the following steps: the control component is used for applying preset voltage to the charging cavity every other first time period and applying the preset voltage to the charging cavity for a second time period.
Specifically, the charging cavity comprises two substrates which are oppositely arranged, and the two substrates are connected with the same electrode of the control component.
Specifically, the electric field cavity comprises a first voltage plate and a second voltage plate, the first voltage plate is used for being connected with the positive pole of a power supply, the second voltage plate is used for being connected with the negative pole of the power supply, a deflection electric field is formed between the first voltage plate and the second voltage plate, and the acquisition component is arranged outside the deflection electric field.
Specifically, the direction of the electric field lines of the deflecting electric field is parallel to the direction of gravity.
In another aspect, embodiments of the present invention also provide a system for measuring a volume of an ink droplet, the system including: the ink box and the device for measuring the volume of the ink drop provided by any one of the above embodiments are connected with a spray head, a plurality of nozzles are arranged on the spray head, the nozzles are arranged corresponding to the charging cavity of the device for measuring the volume of the ink drop, and the ink box is grounded.
In another aspect, embodiments of the present invention also provide a method of measuring a volume of an ink droplet, the method including:
charging the ink droplets with a predetermined charge;
leading the ink drops with preset charges to enter a deflection electric field, and deflecting the motion tracks of the ink drops;
the volume of the ink drop is calculated based on a first distance along the electric field lines in the deflection electric field, a second distance along the electric field lines in the electric field, an amount of charge of the pre-set charge, and an electric field strength of the deflection electric field. The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Specifically, the step of causing the ink drops with the preset electric charges to enter the deflecting electric field is specifically as follows:
ink droplets with a predetermined charge are caused to enter the deflecting electric field in a direction perpendicular to the electric field lines.
Specifically, the calculating the volume of the ink drop according to the first distance of the ink drop moving along the direction perpendicular to the electric field lines in the electric field, the second distance of the ink drop moving along the electric field lines in the electric field, the charge amount of the preset charge, and the electric field intensity of the deflecting electric field is as follows:
acquiring a first distance of ink drops ejected by the nozzle in batches, wherein the first distance of the ink drops moves in the deflection electric field along the direction vertical to the electric field lines, and a second distance of the ink drops moves in the deflection electric field along the electric field lines;
calculating the volume of the ink drop according to the first distance, the second distance, the charge quantity of the preset charge and the electric field intensity of the deflection electric field;
wherein the first distance and the second distance of the ink droplets ejected by the at least two nozzles are acquired at a time.
Specifically, the charging the ink droplet with the preset charge specifically includes:
starting to make ink drops ejected from the nozzles carry the preset charges at intervals of a first time period;
and enabling the ink drops ejected by the nozzles in the second time period to be charged with the preset electric charge.
The invention provides a device, a system and a method for measuring the volume of an ink drop, wherein the speed of the ink drop is specific after the ink drop is sprayed out of a nozzle, the speed and the volume are in a linear relation, the ink drop enters a charging cavity to be provided with a preset charge and then enters a deflection electric field, the movement track of the ink drop with the preset charge deflects after entering the deflection electric field, the speed along the direction vertical to electric field lines does not change, the volume of the ink drop can be reversely pushed by measuring a first distance of the ink drop moving along the direction vertical to the electric field lines and a second distance of the ink drop moving along the electric field lines in the deflection electric field, the flying distance of the ink drop can be adjusted by adjusting the electric field strength and the electric charge quantity of the preset charge, and the flying distance can amplify the micro change generated by the speed of the ink drop due to the small magnitude order of the electric field strength and the preset charge quantity, and further, the calculation of the ink drop speed is accurate, and a certain linear relation exists between the ejection speed of the ink drop and the volume of the ink drop, so that the volume of the ink drop can be calculated more accurately.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a system for measuring drop volume according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a system for measuring drop volume;
FIG. 3 is a schematic diagram of another embodiment of a system for measuring drop volume;
FIG. 4 is a schematic diagram of another embodiment of a system for measuring drop volume;
FIG. 5 is a schematic diagram of another embodiment of a system for measuring drop volume;
FIG. 6 is a schematic diagram of another embodiment of a system for measuring drop volume;
FIG. 7 is a schematic flow chart of a method of measuring drop volume provided by an embodiment of the present invention;
fig. 8 is a schematic flow chart of a method for measuring the volume of an ink droplet according to an embodiment of the present invention.
The reference numbers illustrate:
1-acquisition component, 2-charging cavity, 21-substrate, 3-electric field cavity, 31-first electric pressing plate, 32-second electric pressing plate, 4-control component, 41-charging power supply, 42-controller, 5-ink box, 51-spray head, 52-spray nozzle, and 6-processing circuit.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of an apparatus, a system and a method for measuring the volume of ink droplets according to the present invention, and the specific implementation, structure, features and effects thereof with reference to the accompanying drawings and preferred embodiments.
In one aspect, as shown in fig. 1 to 6, an embodiment of the present invention further provides an apparatus for measuring a volume of an ink droplet, the apparatus including: a charging chamber 2 for being disposed opposite to the nozzle 52 to allow the ink droplets ejected from the nozzle 52 to enter the charging chamber 2, and for charging the ink droplets with a preset charge; the electric field cavity 3 is communicated with the charging cavity 2, and a deflection electric field is formed in the electric field cavity 3 and is used for deflecting the ink drops; the collecting component 1, collecting component 1 sets up in electric field chamber 3, and collecting component 1 is used for acquireing the first distance of ink droplet along the motion perpendicular to electric field line in the electric field of deflecting, the second distance along electric field line motion in the electric field: and the processing circuit 6 is connected with the acquisition part 1, and the processing circuit 6 is used for calculating the volume of the ink drops according to the first distance and the second distance of the ink drops, the charge amount of the preset charges and the electric field intensity of the deflection electric field. The method for measuring the volume of the ink drop provided by the above embodiment is implemented by the apparatus for measuring the volume of the ink drop provided by the embodiment.
Specifically, the charging chamber 2 is disposed opposite to the nozzles 52, the nozzle 51 is provided with a plurality of nozzles 52, as shown in fig. 5 and 6, the nozzle 51 is provided with a row of nozzles 52, wherein the charging chamber 2 can be disposed opposite to all the nozzles 52, that is, after the nozzles 52 eject ink droplets, the ink droplets can enter the charging chamber 2, in addition, the charging chamber 2 can be disposed corresponding to the plurality of nozzles 52, and after the ink droplet volume of the nozzle 52 corresponding to the charging chamber 2 is measured, the nozzle 51 is moved so that the nozzle 52, the ink droplet volume of which is not measured, is opposite to the charging chamber 2. Generally, the front end of the nozzle 52 is provided with a piezoelectric crystal, which is subjected to periodic mechanical deformation under a sinusoidal driving voltage, and before the ink jet operation, the piezoelectric crystal contracts slightly under the control of the sinusoidal driving voltage, and then, the piezoelectric crystal generates a large extension to push the ink droplet out of the nozzle 52, and at the instant when the ink droplet is about to fly away from the nozzle 52, the piezoelectric crystal contracts again to contract the ink pressure surface from the nozzle 52, so that the liquid level of the ink droplet is accurately controlled, and the ink droplet ejected each time has a perfect shape and a correct flight direction, wherein not only the sinusoidal driving voltage but also a square wave driving voltage can be used, and no specific limitation is made herein. Ink is pre-stored in the cartridge 5 and then ejected from the nozzle 52 to form an ink droplet, which is not charged when ink is still present in the cartridge 5. When the ink drop is not completely ejected out of the nozzle 52, pre-squeezing-off occurs, which means that the ink is not completely broken, at this time, the ink enters the charging chamber 2, and due to the action of the charging chamber 2, the electric charge in the ink generates a bipolar differentiation phenomenon, at this time, if the charging chamber 2 has positive voltage, under the action of the electric field force, the positive charge in the "pre-squeezing-off" ink is repelled by the charging chamber 2, and then the positive charge is close to the nozzle 52, while the negative charge is attracted, and then the negative charge is close to the charging chamber 2, at this time, due to the action of the ink surface tension, the "pre-squeezing-off" ink breaks open, the ink drop with negative charge is separated from the nozzle 51, passes through the charging chamber 2, and flies out of the charging chamber 2, and the ink drop with positive charge. The ink droplets flying out of the charging chamber 2 enter the electric field chamber 3, i.e., enter the deflecting electric field, and the velocity of the ink droplets moving in the charging chamber 2 is kept in agreement with the velocity of the ink droplets when ejected from the nozzle 52 and moves in a straight line.
As shown in fig. 1, the collecting member 1 is disposed in the electric field chamber 3 so as to obtain the first distance and the second distance. Specifically, as shown in fig. 1, a row of nozzles 52 is disposed on the nozzle 51, the nozzles 52 are arranged in a direction facing into the paper, the data is transmitted to the processing circuit 6 after the acquisition component 1 acquires the first distance and the second distance, the processing circuit 6 calculates the first distance and the second distance of the ink drop at a certain time in the deflection electric field, and then calculates the volume of the ink drop. The acquisition component 1 is an image sensor. Specifically, the image sensor is disposed near the first electric pressure plate 31 or the second electric pressure plate 32, the image sensor may be a CCD (charge coupled device image sensor), the CCD can take a large number of pictures in a short time, the pictures taken by the CCD are sent to the processing circuit 6, the processing circuit 6 selects the pictures in which the ink droplet is about to drop, at this time, the ink droplet is still in the air but has not collided with the voltage plate, the ink droplet is still circular, the processing circuit 6 can determine the center of the circle more easily, and it can be ensured that the acquired values of the first distance and the second distance are more accurate, as shown in fig. 3, S and h when the ink droplet is about to drop are indicated. At this time, the CCD is disposed toward the charging chamber 2. When the first distance and the second distance are acquired by acquiring the landing point of the ink droplet, if the ink droplet lands on the first electric plate 31, the CCD faces the first electric plate 31, and fig. 4 is a schematic diagram of acquiring S and h by the landing point of the ink droplet. The CCD can move in the electric field cavity 3, a moving track of the CCD is arranged in the electric field cavity 3, the CCD is arranged on the motor, the motor can move along the track, the track is arranged along the edge of the electric pressing plate and is not in the coverage area of the deflection electric field, the motor is electrically connected with the processing circuit 6, and the processing circuit 6 controls the motor to move. The visual field of the CCD can be adjusted, when the visual field of the CCD is larger, the focusing accuracy of the CCD is lower, and the value error of the acquired first distance and the acquired second distance is larger. When the visual field of the CCD is small, the focusing accuracy is high, the first distance and the second distance are accurate, and a user determines the visual field of the CCD according to requirements. As shown in fig. 5, the positions of the ink droplets at the same time are different from each other due to the different volumes of the ink droplets, and the positions of the ink droplets at the same time are different from each other after entering the deflection electric field.
The following specifically describes the relationship between the ink droplet volume and the charge amount of the preset charge, the electric field strength of the deflection electric field, and the first distance S and the second distance h, and specifically, V is the ink droplet volume; ink drop mass m; the electrification amount of the preset electric charge carried by the ink drop after passing through the charging cavity 2 is q; the electric field intensity E of the deflection electric field; the velocity at which the ink droplets are ejected from the nozzles 52 is v;
①V＝k1v(k1as a factor between velocity and volume);
②m＝k2V(k2as a factor between velocity and volume);
f ═ Eq (F is the electric field force to which the ink drop is subjected);
(iv) a ═ Eq/m (a is the acceleration of the drop after it enters the deflection field, the direction of the acceleration being the same as the direction of the field force);
⑤
(t is the time the drop moves in the deflecting electric field);
obtaining formula ⑥ from formula ①②③④⑤
Further, the formula ⑦ is obtained
The formula ⑦ is then substituted into the formula ⑧
(wherein,
)；
wherein h, k1、k2E, q are all known, i.e. k3Is constant, the relationship between the magnitude of S and the velocity v can be determined, since S and
in a direct proportion, under the condition that V is constant, the value of S measured in the application is larger, the value of S can be increased by adjusting the values of E and q, and meanwhile, since V and V are in a linear relation, namely V changes along with V under the condition that V changes, and the change of V can be presented by amplifying S, the speed test is more sensitive, the precision of the speed measurement is higher, and the measurement of the volume is more accurate. Wherein if the change in v is further amplified, i.e. S is increased, the values of E and q may be changed.
From equation ⑧, equation ⑨ can be derived
Combining formula ⑨ and formula ① yields formula ⑩
The volume of the ink drop can be obtained through the calculation, and the method for measuring the volume of the ink drop is accurate. In the method of determining the volume of the ink droplet in the prior art, since the volume V of the ink droplet has a linear relationship with the velocity V of the ink droplet when the ink droplet is ejected from the nozzle 52, the volume of the ink droplet can also be obtained by measuring the velocity V of the ink droplet. The method for calculating the volume of the ink drop is improved to a certain extent, but is limited by the excessively short flying distance of the ink drop and the stability of the flying photographing position of the ink drop, the error is large, and the volume of the ink drop is accurately calculated by prolonging the flying distance of the ink drop along the ejection direction. Here, it should be further noted that, when the first distance and the second distance are obtained by acquiring the movement trajectory of the ink droplet, the first distance and the second distance corresponding to different points on the movement trajectory are different for the same ink droplet, and the ink droplets having different volumes have different first distances and second distances at the same time.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Specifically, as shown in fig. 1, the control part 4 is configured to be connected with the charging chamber 2, and the control part 4 is configured to apply a preset voltage to the charging chamber 2 every first period and apply the preset voltage to the charging chamber 2 for a second period. Specifically, the control part 4 includes a charging power source 41 and a controller 42, the positive pole of the charging power source 41 is connected with the controller 42, the controller 42 is used for controlling the preset voltage applied to the charging chamber 2 for the second time period every first time period, and the negative pole of the charging power source 41 is grounded. The nozzle 52 ejects one drop of ink at intervals, and the time interval is very short, so that the ink drop can be ejected for multiple times in a short time, when the first distance and the second distance of the ink drop are acquired, generally, one collecting component 1 moves for multiple times to acquire the first distance and the second distance of all the ink drops, when the collecting component 1 moves from the current position to the next position, a preset time period needs to elapse, the ink drop does not need to be charged, and energy can be saved, wherein the first time period is the time required for the collecting component 1 to move from the current position to the next position, and the second time period is the time required for the collecting component 1 to acquire the first distance and the second distance, wherein the second time period is more than or equal to the time required for the ink drop to be ejected from the nozzle 52 until the ink drop is dropped, so as to ensure that the collecting component 1 can acquire all the movement tracks, and further the first distance and the second distance to the moment when the ink drop is about to drop, at the moment, the ink drop is still in the air and is circular in shape, so that the circle center is conveniently obtained.
Specifically, as shown in fig. 1 and 2, the charging chamber 2 includes two substrates 21 disposed opposite to each other, and the two substrates 21 are connected to the same electrode of the control part 4. The charging chamber 2 includes two opposing substrates 21, and both substrates 21 are connected to the same electrode of the control part 4, so that both substrates 21 are charged with positive or negative electricity. When both the substrates 21 are connected to the positive electrode of the control part 4, at this time, the two substrates 21 are positively charged, the two positively charged substrates 21 can charge the ink droplets negatively, and conversely, the two negatively charged substrates 21 can charge the ink droplets positively.
Specifically, as shown in fig. 1 to 4, the electric field chamber 3 includes a first electric pressure plate 31 and a second electric pressure plate 32, the first electric pressure plate 32 is used for being connected with a positive pole of a power supply, the second electric pressure plate 32 is used for being connected with a negative pole of the power supply, a deflection electric field is formed between the first electric pressure plate 31 and the second electric pressure plate 32, and the collecting member 1 is disposed outside the deflection electric field. The electric field chamber 3 includes a first electric pressure plate 31 and a second electric pressure plate 32, the first electric pressure plate 31 and the second electric pressure plate 32 are respectively connected to a positive electrode and a negative electrode of a power supply, so that the first electric pressure plate 31 is positively charged, and the second electric pressure plate 32 is negatively charged, so that a deflection electric field can be formed between the first electric pressure plate 31 and the second electric pressure plate 32, wherein the deflection electric field is preferably a uniform electric field. When entering the electric field chamber 3, the ink drop will hit the first electric pressure plate 31 or the second electric pressure plate 32, if the ink drop is positively charged, the ink drop will hit the second electric pressure plate 32, and if the ink drop is negatively charged, the ink drop will hit the first electric pressure plate 31.
Specifically, the direction of the electric field lines of the deflecting electric field is parallel to the direction of gravity. The electric field lines of the deflection electric field are parallel to the direction of gravity, so that the movement distance of the ink drop along the direction vertical to the electric field lines is not influenced by the gravity, and the speed of the ink drop is convenient to calculate.
In another aspect, as shown in fig. 5, an embodiment of the present invention also provides a system for measuring a volume of an ink droplet, the system including: the ink cartridge 5 and the device for measuring the volume of the ink drop provided in any of the above embodiments, the ink cartridge 5 is connected with a nozzle 51, the nozzle 51 is provided with a plurality of nozzles 52, the nozzles 52 are arranged corresponding to the charging chamber 2 of the device for measuring the volume of the ink drop, and the ink cartridge 5 is grounded. The system for measuring the volume of an ink droplet provided in this embodiment includes the apparatus for measuring the volume of an ink droplet provided in any one of the above embodiments, and therefore this embodiment includes all the beneficial effects of the apparatus for measuring the volume of an ink droplet provided in any one of the above embodiments, which are not described herein again. In addition, the ink cartridge 5 is subjected to grounding treatment because, when the "pre-squeezed" ink droplets are opened, the ink droplets having a positive or negative charge return to the head 51, and in order to avoid charge accumulation in the ink cartridge 5, the ink cartridge 5 is grounded, and the charges of the ink droplets returning to the head 51 can be neutralized. The nozzle 52 has been specifically described in the above embodiments, and details thereof are not repeated, the piezoelectric crystal is disposed on the nozzle 52, and the volume and the speed of the ejected ink drop are related to the peak value of the driving voltage applied to the piezoelectric crystal, so that the volume and the speed of the ink drop can be adjusted by adjusting the peak value of the driving voltage.
In one aspect, embodiments of the present invention provide a method of measuring a volume of an ink droplet, as shown in fig. 7, the method including:
s1, enabling the ink drops to be charged with preset charges; the velocity of the ink droplets is constant after the ink droplets are ejected from the nozzles 52, and the ink droplets are moved in a straight line after being ejected from the nozzles 52. After the ink drops are charged with preset charges, the ink drops can deflect in a deflection electric field, and the preset charges can be positive charges or negative charges.
S2, enabling the ink drops with preset charges to enter a deflection electric field, and deflecting the motion tracks of the ink drops; the motion trajectory of the ink drop before entering is not on the same straight line with the electric field lines of the deflecting electric field, and a preset included angle is formed between the motion trajectory of the ink drop and the electric field lines, wherein the preset included angle is preferably 90 degrees, as shown in fig. 2, and α is the preset included angle. The ink drop will drop after a period of time of deflection motion, and the drop referred to herein means that the ink drop is deflected by the electric field force along the direction of the electric field force, and finally collides with other media to stop moving.
And S3, calculating the volume of the ink drop according to the first distance of the ink drop moving along the direction vertical to the electric field lines, the second distance of the ink drop moving along the electric field lines, the charge quantity of the preset charge and the electric field intensity of the deflected electric field. The drop volume is then calculated by taking a first distance S, by which the drop moves in the deflection field in a direction perpendicular to the electric field lines, and a second distance h, by which the drop moves along the electric field lines.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Specifically, the entering of the ink droplets with the preset electric charge into the deflecting electric field is specifically:
ink droplets with a predetermined charge are caused to enter the deflecting electric field in a direction perpendicular to the electric field lines. To facilitate the calculation of the volume of the ink drop, it is preferred that the ink drop is caused to enter the deflection electric field in a direction perpendicular to the electric field lines, wherein the electric field lines in the deflection electric field are perpendicular to the direction of gravityAnd when the ink drop moves in the deflecting electric field, the gravity of the ink drop has no influence on S, so that the calculation is convenient. Wherein the value of E is preferably 106The value of N/C and q is preferably 10-16C。
Specifically, as shown in fig. 8, calculating the volume of the ink drop according to a first distance of the ink drop moving in the electric field along a direction perpendicular to the electric field lines, a second distance of the ink drop moving in the electric field along the electric field lines, the charge amount of the preset charge, and the electric field intensity of the deflection electric field is specifically as follows:
s3.1, acquiring a first distance of the ink drops ejected by the nozzle 52 in batches, wherein the first distance is perpendicular to the electric field lines in the deflection electric field, and the second distance is along the electric field lines in the electric field; the nozzle 51 is provided with only one row of nozzles 52, the number of the nozzles 52 is multiple, when the first distance and the second distance of the ink drop are acquired, a CCD (charge coupled device image sensor) is needed, but because the price of the CCD is higher, only one CCD or a small number of CCDs are arranged in a device for measuring the volume of the ink drop, the landing points of all the ink drops can be acquired by shooting images for multiple times and then acquiring the first distance and the second distance of the ink drop sprayed by all the nozzles 52 in a deflection electric field, so that the number of the CCDs can be reduced by acquiring the first distance and the second distance of the ink drop of each nozzle 52 in batches, and the cost is saved.
S3.2, calculating the volume of the ink drop according to the first distance, the second distance, the charge quantity of the preset charges and the electric field intensity of the deflection electric field; after the first distance and the second distance of the ink droplets in each nozzle 52 are acquired in batches, the volume of the ink droplets ejected by each nozzle 52 is sequentially calculated, or the first distance and the second distance of one batch of ink droplets can be acquired and then calculated.
In which the landing points of the ink droplets ejected from at least two nozzles 52 are acquired at a time. In batch division of the landing points of the acquired ink droplets, at least the landing points of the ink droplets ejected from two nozzles 52, preferably 3, may be acquired at a time, and each CCD may acquire the first distance and the second distance of the ink droplets ejected from 3 nozzles 52 at a time, as shown in fig. 6, the plurality of nozzles 52 are divided into areas, wherein the three nozzles 52 are one area, the first distance and the second distance CCD of the ink droplets ejected from the nozzles 52 in one area can be simultaneously acquired, after the landing point of the ink droplet ejected from the nozzle 52 in the area is obtained, the CCD is moved to the area corresponding to the landing point of the ink droplet in the next area, then, the positions of the ink drop landings in the area are acquired, and the first distance and the second distance of the ink drops of all the nozzles 52 at a certain time can be acquired by moving the positions of the CCDs for a plurality of times, so that the requirement can be met by only arranging one CCD. Of course, if a plurality of CCDs are provided in order to shorten the time for acquiring the entire ink droplet volume, and further, if a lot can acquire a larger number of ink droplet volumes, the detection time is shortened, when two CCDs are provided, a lot can acquire the first distance and the second distance for the six nozzles 52 to eject the ink droplets.
Specifically, charging the ink droplets with a predetermined charge is specifically: s1.1, ink droplets ejected from the nozzles 52 are charged with a predetermined charge beginning at each first time interval. In the above embodiment, it is proposed that, when the drop point of the ink drop is obtained, the volume of the ink drop ejected from all the nozzles 51 is usually calculated by a CCD through multiple movements, and when the CCD moves from the current position to the next position, a first time period needs to pass, and at this time, the ink drop does not need to be charged, so that energy can be saved, wherein the time required for the CCD to move from the current position to the next position, that is, the time required for obtaining the first distance and the second distance of the ink drop in two adjacent batches, that is, the first time period.
S1.2, enabling the ink drops ejected by the nozzle 52 in the second time period to be charged with preset charges. The second period of time is equal to or longer than the time that elapses until the ink droplet is ejected from the nozzle 52 until the droplet lands. When the CCD has moved to a predetermined position, the CCD begins to determine the position of the ink droplet, and the ink droplets ejected from the nozzles 52 begin to carry a predetermined charge, and the ink droplets ejected during the second period of time are all carried by the predetermined charge, and specifically the ink droplets can be carried by the charging chamber 2, and when the ink droplets are carried by the predetermined charge, the charging chamber 2 is connected to the circuit, and when the ink droplets are not required to be charged, the charging chamber 2 is disconnected from the charging source 41, or the voltage applied by the charging chamber 2 is zero. The second time period is longer than the time required by the ink drop ejected from the nozzle 52 until the ink drop drops, so that the CCD can acquire all movement tracks of the ink drop ejected from the nozzle to the ink drop drops, and the phenomenon that the calculated V value is incorrect due to the fact that the time is too short and the distance from the ink drop to the movement of the deflection electric field is too short is avoided.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An apparatus for measuring drop volume, comprising:
a charging chamber for being disposed opposite to the nozzle so that an ink droplet ejected from the nozzle enters the charging chamber and for charging the ink droplet with a predetermined charge;
the electric field cavity is communicated with the charging cavity, and a deflection electric field is formed in the electric field cavity and is used for deflecting the ink drops;
the collecting component is arranged in the electric field cavity and used for acquiring a first distance of the ink drops moving along the electric field lines in the deflection electric field and a second distance of the ink drops moving along the electric field lines in the deflection electric field:
and the processing circuit is connected with the collecting part and is used for calculating the volume of the ink drops according to the first distance and the second distance of the ink drops, the charge quantity of the preset charges and the electric field intensity of the deflection electric field.
2. An apparatus for measuring drop volume as defined in claim 1,
further comprising: the control component is used for applying preset voltage to the charging cavity every other first time period and applying the preset voltage to the charging cavity for a second time period.
3. An apparatus for measuring ink drop volume according to claim 2,
the charging cavity comprises two substrates which are oppositely arranged, and the two substrates are connected with the same electrode of the control part.
4. An apparatus for measuring drop volume as defined in claim 1,
the electric field cavity comprises a first voltage plate and a second voltage plate, the first voltage plate is used for being connected with the positive pole of a power supply, the second voltage plate is used for being connected with the negative pole of the power supply, a deflection electric field is formed between the first voltage plate and the second voltage plate, and the acquisition component is arranged outside the deflection electric field.
5. An apparatus for measuring drop volume as defined in claim 1,
the direction of the electric field lines of the deflecting electric field is parallel to the direction of gravity.
6. A system for measuring drop volume, comprising:
an ink cartridge and a device for measuring the volume of an ink drop according to any one of claims 1 to 5, wherein the ink cartridge is connected with a spray head, a plurality of nozzles are arranged on the spray head, the nozzles are arranged corresponding to the charging cavity of the device for measuring the volume of the ink drop, and the ink cartridge is grounded.
7. A method of measuring a volume of an ink droplet, for use in an apparatus for measuring a volume of an ink droplet according to claim 1, comprising:
charging the ink droplets with a predetermined charge;
leading the ink drops with preset charges to enter a deflection electric field, and deflecting the motion tracks of the ink drops;
the volume of the ink drop is calculated based on a first distance along the electric field lines in the deflection electric field, a second distance along the electric field lines in the electric field, an amount of charge of the pre-set charge, and an electric field strength of the deflection electric field.
8. A method of measuring drop volume as claimed in claim 7,
the step of causing the ink drops with the preset electric charges to enter the deflecting electric field is specifically as follows:
ink droplets with a predetermined charge are caused to enter the deflecting electric field in a direction perpendicular to the electric field lines.
9. A method of measuring drop volume as claimed in claim 7,
the calculating of the volume of the ink drop according to the first distance of the ink drop moving along the direction perpendicular to the electric field lines in the electric field, the second distance of the ink drop moving along the electric field lines in the electric field, the charge amount of the preset charge and the electric field intensity of the deflection electric field is specifically as follows:
acquiring a first distance of ink drops ejected by the nozzle in batches, wherein the first distance of the ink drops moves in the deflection electric field along the direction vertical to the electric field lines, and a second distance of the ink drops moves in the deflection electric field along the electric field lines;
calculating the volume of the ink drop according to the first distance, the second distance, the charge quantity of the preset charge and the electric field intensity of the deflection electric field;
wherein the first and second distances are acquired at a time for at least two ink drops, and each ink drop is ejected by a different nozzle.
10. A method of measuring drop volume as in claim 9,
the step of charging the ink droplets with the preset charges is specifically as follows:
starting to make ink drops ejected from the nozzles carry the preset charges at intervals of a first time period;
and enabling the ink drops ejected by the nozzles in the second time period to be charged with the preset electric charge.
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| CN113218827B (en) * | 2021-06-07 | 2022-08-09 | 上海大学 | Liquid droplet size detection device based on electric field deflection |
| CN114474998B (en) * | 2022-03-02 | 2023-03-28 | 上海美创力罗特维尔电子机械科技有限公司 | Ink dot recognition monitoring method |
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